diff --git a/PC/VC6/pythoncore.dsp b/PC/VC6/pythoncore.dsp
index 5640682b686..653569fb27f 100644
--- a/PC/VC6/pythoncore.dsp
+++ b/PC/VC6/pythoncore.dsp
@@ -341,6 +341,10 @@ SOURCE=..\dl_nt.c
 # End Source File
 # Begin Source File
 
+SOURCE=..\..\Python\dtoa.c
+# End Source File
+# Begin Source File
+
 SOURCE=..\..\Python\dynload_win.c
 # End Source File
 # Begin Source File
diff --git a/PC/VS7.1/pythoncore.vcproj b/PC/VS7.1/pythoncore.vcproj
index e24e5730b6c..d60f7921c6b 100644
--- a/PC/VS7.1/pythoncore.vcproj
+++ b/PC/VS7.1/pythoncore.vcproj
@@ -516,6 +516,9 @@
 		<File
 			RelativePath="..\..\PC\dl_nt.c">
 		</File>
+		<File
+			RelativePath="..\..\Python\dtoa.c">
+		</File>
 		<File
 			RelativePath="..\..\Python\dynload_win.c">
 		</File>